I am not sure if this belongs in the Qt forums or the OpenGL forums, but I thought I would try anyhow. I am using a QGLWidget on an HP workstation that has 4 monitors. There are, however, only 2 video cards with one digital output each. The output is split into 2 connectors using a video splitter cable. I am running Linux Red Hat WS and the xorg.conf file is setup to span 2 desktops across 2 monitors.

The Problem:
The issue I am having is that any OpenGL widget will only appear on monitor 0. Monitors 1 - 3 do not display anything. Anything built using Qt (minus the QGLWidget) appear correctly. I am really not sure how to solve this problem, and the monitor/computer setup cannot change easily (meaning, somone other than me has to make the modification decision). Is there anything I can do in Qt to fix the problem? Or do I need to suggest a different setup for the machine?

Qt Code: 
  1. Section "ServerLayout"
  2.    Identifier    "single head configuration"
  3.    Screen       0 "Screen0" 0 0
  4.    Screen       1 "Screen1" Rightof "Screen0"
  5.    Screen       2 "Screen2" Rightof "Screen1"
  6.    Screen       3 "Screen3" Rightof "Screen2"
  7.    InputDevice    "Mouse0" "CorePointer"
  8.    InputDevice    "Keyboard0" "CoreKeyboard"
  9. EndSection
  10.  
  11. Section "ServerFlags"
  12.    Option   "Xinerama" "1"
  13. EndSection
  14.  
  15. : // Left out InputDevice sections
  16.  
  17. Section "Monitor"
  18.    Identifier "Monitor0"
  19.    VendorName "HP"
  20.    ModelName   "HP 1825 Flat Panel Monitor"
  21.    DisplaySize   360 290
  22.    HorizSync     30.0 - 82.0
  23.    VertRefresh  56.0 - 76.0
  24.    Option          "dpms"
  25. EndSection
  26.  
  27. Section "Monitor"
  28.    Identifier "Monitor1"
  29.    VendorName "HP"
  30.    ModelName   "HP 1825 Flat Panel Monitor"
  31.    DisplaySize   360 290
  32.    HorizSync     30.0 - 82.0
  33.    VertRefresh  56.0 - 76.0
  34.    Option          "dpms"
  35. EndSection
  36.  
  37. Section "Monitor"
  38.    Identifier "Monitor2"
  39.    VendorName "HP"
  40.    ModelName   "HP 1825 Flat Panel Monitor"
  41.    DisplaySize   360 290
  42.    HorizSync     30.0 - 82.0
  43.    VertRefresh  56.0 - 76.0
  44.    Option          "dpms"
  45. EndSection
  46.  
  47. Section "Monitor"
  48.    Identifier "Monitor3"
  49.    VendorName "HP"
  50.    ModelName   "HP 1825 Flat Panel Monitor"
  51.    DisplaySize   360 290
  52.    HorizSync     30.0 - 82.0
  53.    VertRefresh  56.0 - 76.0
  54.    Option          "dpms"
  55. EndSection
  56.  
  57. Section "Device:
  58.    Identifier "Videocard0"
  59.    Driver     "nvidia"
  60.    VendorName "Nvidia"
  61.    BoardName   "Nvidia Quadro 4 (generic)"
  62.    Option          "TwinView" "True"
  63.       Option           "TwinViewOrientation" "RightOf"
  64.       Option           "UseEdidFreqs"    "True"
  65.       Option           "MetaModes" "1024x768, 1024x768"
  66.    BusID   "PCI:1:0:0"
  67.    Screen 0
  68. EndSection
  69.  
  70. Section "Device:
  71.    Identifier "Videocard1"
  72.    Driver     "nvidia"
  73.    VendorName "Nvidia"
  74.    BoardName   "Nvidia Quadro 4 (generic)"
  75.    Option          "TwinView" "True"
  76.       Option           "TwinViewOrientation" "RightOf"
  77.       Option           "UseEdidFreqs"    "True"
  78.       Option           "MetaModes" "1024x768, 1024x768"
  79.    BusID   "PCI:1:0:0"
  80.    Screen 1
  81. EndSection
  82.  
  83. Section "Device:
  84.    Identifier "Videocard2"
  85.    Driver     "nvidia"
  86.    VendorName "Nvidia"
  87.    BoardName   "Nvidia Quadro 4 (generic)"
  88.    Option          "TwinView" "True"
  89.       Option           "TwinViewOrientation" "RightOf"
  90.       Option           "UseEdidFreqs"    "True"
  91.       Option           "MetaModes" "1024x768, 1024x768"
  92.    BusID   "PCI:16:0:0"
  93.    Screen 0
  94. EndSection
  95.  
  96. Section "Device:
  97.    Identifier "Videocard3"
  98.    Driver     "nvidia"
  99.    VendorName "Nvidia"
  100.    BoardName   "Nvidia Quadro 4 (generic)"
  101.    Option          "TwinView" "True"
  102.       Option           "TwinViewOrientation" "RightOf"
  103.       Option           "UseEdidFreqs"    "True"
  104.       Option           "MetaModes" "1024x768, 1024x768"
  105.    BusID   "PCI:16:0:0"
  106.    Screen 1
  107. EndSection
  108.  
  109. Section "Screen"
  110.    Identifier "Screen0"
  111.    Device    "Videocard0"
  112.    Monitor   "Monitor0"
  113.    DefaultDepth  24
  114.    SubSection "Display"
  115.       Viewport 0 0
  116.       Depth     24
  117.       Modes    "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
  118.    EndSubSection
  119. EndSection
  120.  
  121. Section "Screen"
  122.    Identifier "Screen1"
  123.    Device    "Videocard1"
  124.    Monitor   "Monitor1"
  125.    DefaultDepth  24
  126.    SubSection "Display"
  127.       Viewport 0 0
  128.       Depth     24
  129.       Modes    "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
  130.    EndSubSection
  131. EndSection
  132.  
  133. Section "Screen"
  134.    Identifier "Screen2"
  135.    Device    "Videocard2"
  136.    Monitor   "Monitor2"
  137.    DefaultDepth  24
  138.    SubSection "Display"
  139.       Viewport 0 0
  140.       Depth     24
  141.       Modes    "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
  142.    EndSubSection
  143. EndSection
  144.  
  145. Section "Screen"
  146.    Identifier "Screen3"
  147.    Device    "Videocard3"
  148.    Monitor   "Monitor3"
  149.    DefaultDepth  24
  150.    SubSection "Display"
  151.       Viewport 0 0
  152.       Depth     24
  153.       Modes    "1280x1024" "1280x960" "1152x864" "1024x768" "800x600" "640x480"
  154.    EndSubSection
  155. EndSection
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If there are any "spelling" mistakes in the xorg.conf file, please disregard them. I had to type the file in manually. Thanks for any suggestions!